Hi,

We are developing edk2 bios image for our custom board which is based on Ampere SOC.

Custom board has Uart connections as below:
Uart0

* DB9 connector (Uefi console)
* CTS/RTS signals from SOC

Uart3

* DB9 connector
* CTS/RTS signals from GPIO

We have following queries:

1. CTS/RTS signals have usage in edk2 ? or this is useful in OS level only ?
2. Where to enable CTS/RTS control register bits in edk2 source for ampere platform ?
3. Where to configure GPIO's for Uart3 CTS and RTS signals in edk2 source for ampere platform ?
4. Not able to find gpio pad configuration for ampere platform in edk2 source.
5. Could you please help to clarify the above queries ?

Thanks & Regards,
Antony